Vacuum-container



A. A. CURTIS.

' VACUUM CONTAINER.

APPLICATION FILEE MAYZI, 1920.

1,3 60,728. Patented Nov. 30, 1920.

I To all whom it may concern:

UNITED STATES PATENT OFFlCEa ARTHUR CURTIS OF ERIE, PENNSYLVANIA,ASSIGNOR 0F ON -THIRD TO WILLIAM LYONS AND ONE-THIRD T0 W. RATHBURN,BOTH OF ERIE, PENNSYLVANIA.

vAcUU r-coN'rAmEn.

Specification of Letters Patent.

Patented Nov. so, 1920.

. Application filed Kay 21, 1920. SeriaLNo. 383.199.

Be i known that I, ARTHUR A. CURTIS, a citizen of the United States,residing at Erie, in the county of Erie and State of Pennsylvania, haveinvented certain new and useful Improvements in Vacuum-Containers; and Ido hereby declare the following to be a full, clear, and exactdescription of the invention, such as 'will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to the letters of reference markedthereon, forming part of this specification.

My invention-relates to improvements in vacuum contalners' and consistssubstantially 1n constructing such container with double -walls forminga vacuum chamber surrounding the body of the container, preferablyprovided with suitable valve mechanism for closing the exhaust aperturethereof, and a cover or closure for the container having-a vacuumchamber therein, also preferably provided with suitable valve mechanismfor closing the exhaust'aperture thereof, which closure and. thesurrounding vacuum chamber completely inclose the contents of thecontainer.

These and other features of my invention are hereinafter fully set forthand explained.

and illustrated in the accompanying drawings in which Figure 1, shows avertical central section of a milk-can embodyingmy invention.

Fig. 2, shows an enlarged central section of a valve mechanism forclosing and sealing the openings into the vacuum chambers.

In these drawings I have shown a milkcan as an embodiment of myinvention in which A indicates the outer wall'of the sides, and B theouter wall of the bottom thereof;

'A' and B" respectively forming the inner walls thereof, and inclosing avacuum chamber C between said inner and outer walls. These walls Ipreferably make of sheet metal, the joints uniting the parts thereofbeing secured together by soldering, electric welding, or by any of theusual methods of such constructions.

On the top of the can I form an upright sleeve forming the usual inletopenings D in which I insert a removable closure or cover E. Thisclosure is provided with outer and inner walls e and e forming a vacuumchamber E therein. The inner surfaces of the outer walls A and B, andthe outer surfaces of the inner walls A and B, I preferchamber E in theclosure E with a suitable varnish, enamel or other impervious materialindicated on the drawing by the heavy lines and designated by G, for alike purpose as the coatings indicated by F.

For exhausting the air from the vacuum chambers C and E, I provideopenings H (see Fig. 2) in one of the walls of said vacuum chambers,each of which openings is provided with a valve mechanism. for closingand sealing the same. This valve mechanism I preferably make in the formof an externally threaded sleeve H having a conical opening it therein,in which I'place a seal it of rubber or other yielding material andsecure the same in place by means of the internally screw-threaded cap Has clearly illustrated in Fig. 2, thus effectually closing and sealingthe openings to the vacuum chambers, and atthe same time permitting theopenings to be opened should any leakage make the renewal of the vacuumsnecessary.

From the foregoing description it is believed the operation of myinvention is so obvious that further description thereof is unnecessary.Thereforewhat I claim as new and desire to secure by Letters Patent is:

1. The combination in a vacuum container of duplicate metal wallsforming a vacuum chamber between them, an impervious coating on theinner surface of the outer wall, andon the outer surface of the innerwall, an externally screw threaded'sleeve on the outer of said wallshaving a conical opening therein communicating with said vacuum chamber,a removable plug of resilient material for closing said conical opening,and an internally screw threaded cap for compressing and retaining saidplug in place.

2. The combination in a vacuum container of double walls forming avacuum chamber between them, an impervious coatin on the inner surfaceof the outer wall, an on the outer surface of the inner wall, anexternally screw threaded sleeve on the outer wall having a conicalopening therein communieating with said vacuum chamber, a conical plugof resilient material closing said conical opening, an internally screwthreaded cap engaging said screw threaded sleeve for com- 5 pressing andretaining said plug 1n place, a removable hollow cover comprising sideand upper and lower walls forming a vacuum chamber between them, animpervious coating on the inner surface of said walls, an ex- 10ternally screw-threaded sleeve on one of the Walls having a conicalopening therein communicating with said vacuum chamber, a conical plugof resilient material closing said opening, and an internally threadedcap engaging said externally screw-threaded 15 sleeve for compressingand retaining said plug in place.

In testimony whereof I affixmy signature.

ARTHUR A. CURTIS.

